Australia international Jones will be hoping to make his second appearance of the season when Liverpool travel to Bournemouth for their fourth round FA Cup tie on Saturday.
The 31-year-old has found first-team opportunities limited and knows he needs to take his chance when he gets it.
"I've realised that you've got to prepare all the time like you're going to start, so that if that surprise is sprung on you, you're as ready as you can be," Jones told the club's official website.
"There are obviously boys whose chances have been limited. If the gaffer gives you a chance, you've got to try and take it.
"Being a goalkeeper, it's different if you're not playing. It's rare that you come on as a substitute, so in that sense it's rare. But I think in general it's very similar for a lot of players.
"Nothing gets guaranteed, it's purely down to the manager's ideas of the game and what he wants to do and circumstances. I'll just continue on.
"I've said it before - I didn't expect to play so many games last season and this season, you never know what's going to happen."